What is the value of x in trapezoid ABCD?
OX=15
OX-20
OX=45
OX=60
                                             
                                          
                                          
                                        
											 
											Answer:
15.
Step-by-step explanation:
1) property:
m(∠B)+m(∠D)=180°;
2) according to the property:
3x+9x=180°; ⇒ x=15°